[Feature] Send message

README.md

@@ -15,9 +15,9 @@ As a learning feature, I don't plan password forgotten features and similar. Jus
 Regarding the architecture I plan to stick to something relatively simple. However I did not have definitive answers yet.
 At the moment here are the points I think are gonna be true:
 
-- It is a server/client architecture, opposed to P2P (peer-to-peer) ;
-- It is going to use http(s) transport for synchronous communication ;
-- It is going to use some Socket-like transport for real-time.
+  - It is a server/client architecture, opposed to P2P (peer-to-peer) ;
+  - It is going to use http(s) transport for synchronous communication ;
+  - It is going to use some Socket-like transport for real-time.
 
 To store data I'll start with a relationnal database. Regarding the code organization I think I'll follow some hexagonal architecture principals.
 
@@ -59,6 +59,20 @@ If you're having trouble with permissions, ensure you have the executable right:
 sudo chmod +x ./gochat
 ```
 
+Also you can start a PostgreSQL database container with this docker command:
+
+```bash
+docker run --name gochat-server-db -e POSTGRES_PASSWORD=password -p 5432:5432 -d postgres
+ ```
+
+ This way you can run the server like so:
+
+ ```bash
+ DATABASE_URL="postgresql://postgres:password@localhost:5432/postgres?sslmode=disable" ./gochat-server
+```
+
+Keep in mind this is for local development of course, not production ready.
+
 ## Test
 
 Simply run

db/migrations/000001_create_users_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS users;

db/migrations/000001_create_users_table.up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE
+    IF NOT EXISTS users (
+        id UUID PRIMARY KEY,
+        name VARCHAR(255) NOT NULL,
+        email VARCHAR(255) NOT NULL UNIQUE,
+        password VARCHAR(255) NOT NULL,
+        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );

db/migrations/000002_create_rooms_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS rooms;

db/migrations/000002_create_rooms_table.up.sql

@@ -0,0 +1,7 @@
+CREATE TABLE
+    IF NOT EXISTS rooms (
+        id UUID PRIMARY KEY,
+        name VARCHAR(255) NOT NULL,
+        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );

db/migrations/000003_create_messages_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS messages;

db/migrations/000003_create_messages_table.up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE
+    IF NOT EXISTS messages (
+        id UUID PRIMARY KEY, 
+        room_id UUID NOT NULL REFERENCES rooms (id),
+        author_id UUID NOT NULL REFERENCES users (id),
+        content VARCHAR(2000) NOT NULL,
+        created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+        updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );

go.mod

@@ -1,3 +1,20 @@
 module alexandre-gerault.fr/gochat-server
 
 go 1.24.2
+
+require (
+	github.com/fufuok/random v0.0.1
+	github.com/golang-migrate/migrate/v4 v4.18.3
+	github.com/google/uuid v1.6.0
+	github.com/lib/pq v1.10.9
+	github.com/stretchr/testify v1.10.0
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,72 @@
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internal/messaging/application/send_message.go

@@ -0,0 +1,67 @@
+package application
+
+import (
+	"alexandre-gerault.fr/gochat-server/internal/messaging/domain"
+	"github.com/google/uuid"
+)
+
+type SendMessageDto struct {
+	Author_id string
+	Room_id   string
+	Content   string
+}
+
+type SendMessagePresenter interface {
+	MessageSentSuccessfully()
+	MessageEmpty()
+	TooLongMessage()
+	AuthorNotFound()
+	InvalidPayload()
+	UnexpectedError(error string)
+}
+
+type UuidProvider interface {
+	Generate() (uuid.UUID, error)
+}
+
+func SendMessageHandler(
+	author_repository domain.AuthorRepository,
+	message_repository domain.MessageRepository,
+	uuid_provider UuidProvider,
+) func(dto SendMessageDto, presenter SendMessagePresenter) {
+	return func(dto SendMessageDto, presenter SendMessagePresenter) {
+		author_id, author_err := uuid.Parse(dto.Author_id)
+		room_id, room_err := uuid.Parse(dto.Room_id)
+
+		if author_err != nil || room_err != nil {
+			presenter.InvalidPayload()
+			return
+		}
+
+		if len(dto.Content) == 0 {
+			presenter.MessageEmpty()
+			return
+		}
+
+		if len(dto.Content) > 2000 {
+			presenter.TooLongMessage()
+			return
+		}
+
+		if !author_repository.Exist(author_id) {
+			presenter.AuthorNotFound()
+			return
+		}
+
+		message_id, err := uuid_provider.Generate()
+
+		if err != nil {
+			presenter.UnexpectedError(err.Error())
+		}
+
+		message := domain.NewMessage(message_id, room_id, author_id, dto.Content)
+		message_repository.Save(message)
+
+		presenter.MessageSentSuccessfully()
+	}
+}